\documentclass[10pt,aspectratio=169,mathserif]{beamer}		
%设置为 Beamer 文档类型，设置字体为 10pt，长宽比为16:9，数学字体为 serif 风格
\usepackage[UTF8]{ctex}
\usepackage[utf8]{inputenc}
\usepackage{fdu}
\usepackage{amsmath,amsfonts,amssymb,bm}   %导入数学公式所需宏包
\usepackage{color}			 %字体颜色支持
\usepackage{graphicx,hyperref,url}	

\institute{复旦大学软件学院}
\date{2020}
\author{ybmj} 
\title{复旦大学Beamer模板}

\begin{document}
\frame{\titlepage}

\section{第一章}
\section{第二章}
\begin{frame}
    \frametitle{Sample frame title}

    In this slide, some important text will be
    \alert{highlighted} because it's important.
    Please, don't abuse it.

    \begin{block}{Remark}
        Sample text
    \end{block}

    \begin{alertblock}{Important theorem}
        Sample text in red box
    \end{alertblock}

    \begin{examples}
        Sample text in green box. The title of the block is ``Examples".
    \end{examples}
\end{frame}
\section{第三章}

\begin{frame}
    \frametitle{formula}
    $$E=mc^2$$
\end{frame}

\section{第四章}
\subsection{第四章第一节}
\begin{frame}
    \frametitle{标题}
    \framesubtitle{小标题}
    \begin{itemize}
        \item 一二三四
    \end{itemize}
\end{frame}

\end{document}